High-precision low-noise overflow valve

Abstract

The invention provides a high-precision low-noise overflow valve, and belongs to the technical field of overflow valves, the high-precision low-noise overflow valve comprises a valve body, a main valve core, a back pressure valve and a control cavity, the valve body is provided with a water outlet and a water inlet, the top end of the water inlet is provided with a main valve core cavity, and the top end in the main valve core cavity is fixedly provided with a first spring; and one end of the first spring is arranged at the top end of the main valve element, the main valve element is in sliding connection with the main valve element cavity, and the top end of the main valve element cavity is connected with a water cavity through a water hole. The piston pressing sleeve and the screw plug sleeve which are independently arranged are matched with the first elastic piece and the second elastic piece to work, so that when the piston pressing sleeve is reset, the pressure of the water inlet is stable, pressure impact is not generated, howling and vibration are reduced, and noise is reduced during working.

Description

Technical Field

[0001] The invention belongs to the technical field of overflow valves, and in particular relates to a high-precision and low-noise overflow valve. Background Art

[0002] The overflow valve has many uses. In high-pressure and ultra-high-pressure systems, it is mainly used to overflow the system pressure that exceeds the set pressure, while adjusting the pump supply pressure and keeping it basically constant. The overflow valve is divided into two types according to its structural principle: direct-acting type and pilot-operated type.

[0003] The faster the system pressure rises, the greater the pressure overshoot. Pressure overshoot can easily cause leakage at the pipe joints and damage to components, affecting the dynamic performance of the system: For ordinary relief valves, the main valve has a large steady-state hydraulic force, which increases the pressure regulation deviation of the relief valve and affects the static performance of the valve. The pilot valve is actually a small-flow direct-acting relief valve, whose valve core is a cone valve core, and the main valve core is generally also a cone valve core. However, in these structures, the return oil of the valve sleeve is prone to form vortices, and the valve core is a suspended alarm structure that is prone to vibration. A sharp whistling sound will appear under overflow conditions. No matter how the matching relief valve's oil inlet and oil outlet damping and the multi-way valve's oil inlet and oil return structure are changed, the whistling state cannot be changed. Summary of the invention

[0004] The purpose of the present invention is to provide a high-precision and low-noise relief valve, aiming to solve the problem in the prior art that the return oil of the valve sleeve is prone to form vortices, the valve core is a suspended alarm structure and is prone to vibration, and a sharp whistling sound will occur under overflow conditions. No matter how the oil inlet and oil outlet damping of the matching relief valve and the oil inlet and oil return structure of the multi-way valve cavity are changed, the whistling state cannot be changed.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] High-precision and low-noise relief valve, including valve body, stabilizing sleeve, valve seat, ejector pin, guide sleeve, valve seat sleeve, spring seat, spring pressure seat, pressure regulating bolt, protective cap, pressure regulating spring, pressure relief joint, fifth ball seat, pressure regulating screw sleeve, pressure relief valve seat, pressure relief valve check valve spring, first sealing ring, first steel ball, lock nut, second sealing ring, second steel ball, fourth sealing ring and third steel ball;

[0007] The valve seat sleeve is in the guide sleeve, the guide sleeve is connected to the valve seat sleeve by thread, and presses the valve seat to achieve sealing, and the valve seat sleeve is inserted into the bottom of the valve body;

[0008] A second steel ball is pressed on the lower end of the ejector pin, the second steel ball is pressed with the inner hole of the valve seat to form a seal, and the upper end of the ejector pin is pushed by the spring seat;

[0009] One end of the pressure regulating spring is sleeved with the spring seat, and the other end is sleeved with a spring pressure seat, and the pressure regulating spring is arranged in the straightening sleeve as a whole;

[0010] The straightening sleeve is connected to the valve body by means of threads, and a protective cap is provided on the top of the sleeve for protection;

[0011] The pressure relief joint is threadedly connected to the valve body and fixed on the side of the valve body;

[0012] One end of the pressure relief joint is connected to a pressure relief valve seat, and a third steel ball is provided at one end of the pressure relief valve seat, and the third steel ball is pressed with the inner hole of the pressure relief valve seat to form a seal;

[0013] The third steel ball and the fifth ball seat are formed by embedded crimping, one end of the fifth ball seat is provided with a pressure relief valve check valve spring, and the other end of the pressure relief valve check valve spring is provided with a pressure regulating screw sleeve;

[0014] The first steel ball is arranged in the spring pressure seat;

[0015] The pressure regulating bolt is threadedly connected to the upper end of the straightening sleeve;

[0016] The pressure regulating screw sleeve is arranged in the pressure relief joint;

[0017] The first sealing ring is arranged in the valve body;

[0018] The lock nut is threadedly connected to the circumferential surface of the pressure regulating bolt;

[0019] The second sealing ring is arranged in the valve body; and

[0020] The fourth sealing ring is arranged in the valve body.

[0021] As a preferred solution of the present invention, the guide sleeve is provided with damping holes.

[0022] As a preferred solution of the present invention, both the righting sleeve and the spring seat are provided with resistance limiters, and a pressure relief safety hole is provided on the righting sleeve.

[0023] As a preferred solution of the present invention, an adjustable spring is arranged in the back pressure valve.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. Compared with the prior art, the high-precision, low-noise relief valve provided by the present invention has a simple structure and is easy to process. Through the independently arranged piston pressing sleeve and the straightening sleeve working in cooperation with the first elastic member and the second elastic member, when the piston sleeve is reset, the oil inlet pressure is stable without generating pressure shock, thereby reducing howling and vibration and reducing noise generation during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 It is the main sectional stereogram in the present invention.

[0028] In the figure: 1. valve body; 2. righting sleeve; 3. valve seat; 4. ejector pin; 5. guide sleeve; 6. valve seat sleeve; 7. spring seat; 8. spring pressure seat; 9. pressure regulating bolt; 10. protective cap; 11. pressure regulating spring; 12. pressure relief joint; 13. fifth ball seat; 14. pressure regulating screw sleeve; 15. pressure relief valve seat; 16. pressure relief valve check valve spring; 17. first sealing ring; 18. first steel ball; 19. lock nut; 20. second sealing ring; 21. second steel ball; 23. fourth sealing ring; 24. third steel ball. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Example 1

[0031] See also Figure 1 , the present invention provides the following technical solutions:

[0032] A high-precision, low-noise relief valve comprises a valve body 1, a stabilizing sleeve 2, a valve seat 3, a thimble 4, a guide sleeve 5, a valve seat sleeve 6, a spring seat 7, a spring pressure seat 8, a pressure regulating bolt 9, a protective cap 10, a pressure regulating spring 11, a pressure relief joint 12, a fifth ball seat 13, a pressure regulating screw sleeve 14, a pressure relief valve seat 15, a pressure relief valve check valve spring 16, a first sealing ring 17, a first steel ball 18, a lock nut 19, a second sealing ring 20, a second steel ball 21, a fourth sealing ring 23 and a third steel ball 24;

[0033] The valve seat 3 is sleeved in the guide sleeve 5, and the guide sleeve 5 is connected to the valve seat sleeve 6 by a thread, and presses the valve seat 3 to achieve sealing. The valve seat sleeve 6 is penetrated at the bottom of the valve body 1;

[0034] A second steel ball 21 is pressed on the lower end of the ejector pin 4, and the second steel ball 21 is pressed with the inner hole of the valve seat 3 to form a seal, and the upper end of the ejector pin 4 is pushed by the spring seat 7;

[0035] One end of the pressure regulating spring 11 is sleeved with the spring seat 7, and the other end thereof is sleeved with the spring pressure seat 8. The pressure regulating spring 11 is integrally arranged in the straightening sleeve 2;

[0036] The straightening sleeve 2 is connected to the valve body 1 by means of threads, and a protective cap 10 is provided on the top thereof for protection;

[0037] The pressure relief joint 12 is threadedly connected to the valve body 1 and fixed on the side of the valve body;

[0038] One end of the pressure relief joint 12 is connected to a pressure relief valve seat 15, and a third steel ball 24 is provided at one end of the pressure relief valve seat 15. The third steel ball 24 is pressed against the inner hole of the pressure relief valve seat 15 to form a seal.

[0039] The third steel ball 24 and the fifth ball seat 13 are formed by embedded crimping, and a pressure relief valve check valve spring 16 is sleeved on one end of the fifth ball seat 13, and the other end of the pressure relief valve check valve spring 16 is a pressure regulating screw sleeve 14;

[0040] The first steel ball 18 is disposed in the spring pressure seat 8;

[0041] The pressure regulating bolt 9 is threadedly connected to the upper end of the straightening sleeve 2;

[0042] The pressure regulating screw sleeve 14 is arranged in the pressure relief joint 12;

[0043] The first sealing ring 17 is arranged in the valve body 1;

[0044] The lock nut 19 is threadedly connected to the circumferential surface of the pressure regulating bolt 9;

[0045] The second sealing ring 20 is disposed in the valve body 1; and

[0046] The fourth sealing ring 23 is arranged in the valve body 1;

[0047] The guide sleeve 5 is provided with a damping hole;

[0048] Both the righting sleeve 2 and the spring seat 7 are provided with resistance limiters, and a pressure relief safety hole is provided on the righting sleeve 2;

[0049] An adjustable spring is arranged inside the back pressure valve.

[0050] In a specific embodiment of the present invention, firstly, the depth of the pressure-adjusting bolt 9 in the righting sleeve 2 is adjusted, that is, the compression amount of the pressure-adjusting spring 11 is adjusted, thereby adjusting the set pressure of the relief valve; the hydraulic system is started, and depending on the structure of the relief valve itself, when the inlet pressure rises to the set pressure, the liquid first flows into the spring seat 7 from the damping hole of the guide sleeve 5. Due to the effect of the damping hole, when the liquid flows, there is a pressure difference between the cavity of the spring seat 7 and the inlet, and the working pressure gradually rises. When the pressure difference increases to overcome the spring force and friction force of the first elastic member, the spring seat 7 moves upward, and at the same time, the outlet back-pressure valve is opened for rapid discharge. Pressure, at this time the inlet pressure decreases, the pressure difference decreases and the spring seat 7 is reset, so that the inlet pressure is stable without pressure shock and vibration problems. The opening of the main valve core is provided with a damping hole, which can effectively reduce the impact of the hydraulic pressure on the valve body and effectively increase the pressure difference, so that the booster block can stably push the pressure regulating spring 11. The overflow port is provided with a back pressure valve, and the back pressure can be changed by adjusting the second elastic member. A pilot valve front chamber and a pilot valve rear chamber are provided in the valve body 1 to reduce eddy current vibration and reduce noise during operation. The maximum opening pressure of the valve can reach 210MPa, and the working medium can be used for clean water.

[0051] The working principle and use process of the present invention are as follows: first, adjust the depth of the pressure-adjusting bolt 9 in the straightening sleeve 2, that is, adjust the compression amount of the pressure-adjusting spring 11, thereby adjusting the set pressure of the relief valve; start the hydraulic system, and rely on the structure of the relief valve itself. When the inlet pressure rises to the set pressure, the liquid first flows into the spring seat 7 from the damping hole of the guide sleeve 5. Due to the effect of the damping hole, when the liquid flows, there is a pressure difference between the cavity of the spring seat 7 and the inlet, and the working pressure gradually rises. When the pressure difference increases to overcome the spring force and friction force of the first elastic member, the spring seat 7 moves upward, and at the same time opens the outlet back-pressure valve to quickly release the pressure. At this time, the inlet pressure decreases, the pressure difference decreases, and then the spring seat 7 is reset, so that the inlet pressure is stable without generating pressure shock and vibration problems.

[0052] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. High-precision and low-noise relief valve, characterized in that: It comprises a valve body (1), a stabilizing sleeve (2), a valve seat (3), a ejector pin (4), a flow guide sleeve (5), a valve seat sleeve (6), a spring seat (7), a spring pressure seat (8), a pressure regulating bolt (9), a protective cap (10), a pressure regulating spring (11), a pressure relief joint (12), a fifth ball seat (13), a pressure regulating screw sleeve (14), a pressure relief valve seat (15), a pressure relief valve check valve spring (16), a first sealing ring (17), a first steel ball (18), a lock nut (19), a second sealing ring (20), a second steel ball (21), a fourth sealing ring (23) and a third steel ball (24); The valve seat (3) is sleeved in the guide sleeve (5), and the guide sleeve (5) is connected to the valve seat sleeve (6) by means of threads and presses the valve seat (3) to achieve sealing. The valve seat sleeve (6) is inserted into the bottom of the valve body (1); A second steel ball (21) is pressed on the lower end of the ejector pin (4), the second steel ball (21) and the inner hole of the valve seat (3) are pressed to form a seal, and the upper end of the ejector pin (4) is pushed by the spring seat (7); One end of the pressure regulating spring (11) is sleeved with the spring seat (7), and the other end is sleeved with a spring pressure seat (8), and the pressure regulating spring (11) is arranged in its entirety in the straightening sleeve (2); The straightening sleeve (2) is connected to the valve body (1) by means of threads, and a protective cap (10) is provided on the top thereof for protection; The pressure relief joint (12) is threadedly connected to the valve body (1) and fixed on the side of the valve body; One end of the pressure relief joint (12) is connected to a pressure relief valve seat (15), and a third steel ball (24) is provided at one end of the pressure relief valve seat (15), and the third steel ball (24) is pressed with the inner hole of the pressure relief valve seat (15) to form a seal; The third steel ball (24) and the fifth ball seat (13) are formed by embedded crimping, one end of the fifth ball seat (13) is sleeved with a pressure relief valve check valve spring (16), and the other end of the pressure relief valve check valve spring (16) is a pressure regulating screw sleeve (14); The first steel ball (18) is arranged in the spring pressure seat (8); The pressure regulating bolt (9) is threadedly connected to the upper end of the straightening sleeve (2); The pressure regulating screw sleeve (14) is arranged in the pressure relief joint (12); The first sealing ring (17) is arranged in the valve body (1); The lock nut (19) is threadedly connected to the circumferential surface of the pressure regulating bolt (9); The second sealing ring (20) is arranged in the valve body (1); and The fourth sealing ring (23) is arranged in the valve body (1).

2. The high-precision, low-noise relief valve according to claim 1, characterized in that: The guide sleeve (5) is provided with a damping hole.

3. The high-precision, low-noise relief valve according to claim 2, characterized in that: The straightening sleeve (2) and the spring seat (7) are both provided with resistance limiters, and the straightening sleeve (2) is provided with a pressure relief safety hole.

4. The high-precision, low-noise relief valve according to claim 3, characterized in that: An adjustable spring is arranged inside the back pressure valve.

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